Actual result:
The brush rendering is broken - it consists of 2 'nested' brushes now, the internal (dark) one is a real brush which changes upon toggling brush size in Inspector. Overall it looks like 2 brushes overlapping each other are rendered and active. This creates problems with raycasting and it stops functioning as expected. See attached gif video and actual.png screenshot.

Regression introduced in Version 5.5.0a3.

Workaround is to either switch to default layout or disable second Inspector component (doesn't work effectively).

Expected result:
Only one Inspector should be taken into account internally when painting on terrain; second Inspector tab should just reflect changes to the first one. See attached expected.png screenshot.